| 摘要 |
<p>An electric shutter circuit is provide that automatically switches a speed of an electric shutter by an artificial signal processing. The electric shutter circuit having a light quantity controlling unit of a camera using an integrated circuit without an automatic electric shutter function, includes a voltage integrator(1) having a video signal processing unit for inputting a light quantity signal varied on the brightness around the camera and integrating it to change it to a direct current voltage; a hysteresis analog-digital converter(2) for comparing the analog DC voltage inputted from the voltage integrator with a reference voltage at an n numbers of comparator having a hysteresis characteristics to convert it to an n-bit digital; and an encoder(3) for inputting the n-bit digital signal to encode it to m-bit shutter speed switching signal (n>m).</p> |
